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Vulnerabilities CVE-2026-69243

CVE-2026-69243

Medium
Open
TLP:CLEAR

AIOHTTP: HTTP request smuggling via WebSocket upgrade

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Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the HTTP parsers were vulnerable to a request smuggling attack relating to WebSocket upgrades. If using the server-side component, an attacker may be able to execute a request smuggling vulnerability using an edge case in the WebSocket upgrade procedure. A WebSocket upgrade request with a body could cause the parser to switch protocols before the complete request body was received, leaving trailing bytes to be handled as upgraded-protocol or pipelined data rather than normal HTTP body data. This issue is fixed in version 3.14.2.

Details

CVSS Score
6.3
EPSS Score
0.27%

19.7th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 3, 2026
Last Modified
Aug 5, 2026
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